You need to search.
This topic has been covered 1937039r84439647389u24632473 times.

the B16 itself isn't auto, it's the tranny. The motor that you get is transmission non-specific - just that the one you get has to be for a B series.

Did they even make a B16 auto? I think you'd have to get an LS or GSR tranny, but it will work.